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Feb. 24, 1925.

F. T. FLINCHBAUGH CYLINDER REBORING bums 3 Sheets-Shee t 1 Original Filed Feb. 8, 1921 Feb. 24. 1925.

F. T. 'FLINCHBAUGH fiYLINDER REBORING CHINE M Original Filed Feb. 8, 1921 3 Sheets- Shoat 2 Q N ,4 mm +5 5 l 3 ///A .0 d: n v 5 4 .1

F. T FLINCHBAUGH.

Re. 1 6 v F. T. FLINCHBAUGH cwmnnzn ran-Bonnie can; 7

Feb. 24, 1925. I

3 Sheets-Shut 3 Original Filed Feb. 8, 1921' Jinan-"fol; I

Reissued Feb. 24, 1925.

UNITED, STATES PATENT orncs.

FREDERICK T. FLINCHBAUGH, F YORK, PENNSYLVANIA, ASSIGNOR TO WAYNE TOOL MANUFACTURING COMPANY, OF WAYNESBORO, PENNSYLVANIA, A CORPORA- TION or PENNSYLVANIA.

CYLINDER-REBORING MACHINE.

Original No. 1,480,254, dated January 8, 1924, Serial No. 413,392, filed February 8, 1921.

for reissue filed May 12,

To all 10720972 it may concern:

Be it known that I, FREDERICK T. FLINOHBAUGH, a citizen of the United States, residing at York, in the county of York and State of Pennsylvania, have invented certain new and useful Improvements in Cylinden Reboring Machines, of which the following is a specification.

This invention relates to an} improved reboring tool for engine cylinders and has as one of its principal objects to provide a convenient and easily manipulated device of this character which may be readily attached to an engine block for selectively reboring the cylinders thereof.

The invention has as a further object to provide a machine embodying an improved feeding mechanism wherein the rate of feed of the cutter employed may be readily varied for a constant rate of rotation of the boring bar.

A further object of the invention is to provide a machine employing a separable base and gear case, wherein the base maybe at tached to an engine block for supporting the machine centered with respect to any one of the cylinders of the block selectively and wherein the gear case may .be detached from the base for removing the cutter-head, this construction providing an arrangement whereby the centering of the base will not he molested so that by simply replacing the gear case upon the base, work upon the cylinder may be continued.

And the invention has as a still further object to provide a machine wherein the cutter may be mechanically withdrawn from the cylinder into the base so that the gear case and cutter-head may subsequently be removed with case.

Other incidental objects will appear hereinafter.

Referring to the accompanying drawings which are made a part hereof and on which similar reference characters indicate similar parts,

Figure 1 is a fragmentary side elevation of my improved reboring machine.

Figure 2 is an enlarged sectional view of thedevice, showing the machine in position upon an engine block of conventional construction,

Figure 3 is a view similar to Figure 2,

Application 1924. Serial No. 712,885.

the manner in which the cutter may be mechanically retracted within the base of the machine,

Figure 4 is a transverse section on the line l4 of Figure 2, looking in the direction of the arrows,

Figure 5 is a transverse section on the line 55 of Figure 2, looking in the direction of the arrows,

Figure 6 is a'transverse section on the line 66 of Figure 2, looking in the direction of the arrows,

Figure 7 is an enlarged detail section showing the mounting of the feed dogs employed, and

Figure 8 is a detail plain View of the upper end of the boring bar.

In carrying the invention into effect, I employ a cylindrical base 10 provided in opposite sides thereof with sight openings 11 and formed at its lower end with a plurality of projecting lugs 12 by which the base may be bolted to an engine block. In the drawings, I have conventionally shown an engine block at 13 and one of the cylinders of the block at 14. Formed on the base at its upper end are oppositely disposed ears 15.

Mating with the base is a cylindrical gear case or casing 16 upon the bottom wall of which is formed an annular boss or shoulder 17 snugly fitting within the base and centering the gear case with respect thereto. Projecting from the gear case at opposite sides thereof are oppositely disposed cars 18 registering with the ears and freely fitted through the ears 18 to be threaded through the ears 15 are cap bolts 19 detachably connecting the gear case with the base. Closing the gear case is a. cap plate 20 detachably secured in position by a plurality of cap screws and formed on said plate axially thereof, is an upstanding bearing 21. A111 annular shoulder 20 on the cap plate fits in an annular recess in casing 16 thus'insuring proper engagement of the bevel gears hereinafter described and the plate 20 rests on or close to the upper end of beveled gear to hold it in place against the collar 35 which through feed star 37 acts on lug 33 to hold the same down on the upper end of flange 22. The bottom Wall of the gear case is provided with av similar bearing 22 and journaled through said bearings is aboring said web is a rod threaded to provide a feed screw 27 centered with respect to said channel and journaled at its opposite end through a cap plate 28, which, as shown in detail in Figure 8, is screwed to the upper end of the bar, collars 29 being fixed upon the feed screw at opposite sides of said plate for holding the screw against vertical movement. At its upper end the feed screw is formed with a squaredterminal 30 and rising from the cap plate is a pin or post 31 with which is removably engaged a locking plate 32 fitting over the terminal 30 of the feed screw for holding said screw against rotation.

Slidably surrounding the boring bar 23 within the gear case 16 is a bearing plate or ring 33 resting upon the inner end of the bearing 22 and, as best shown in Figure 6, provided at one side with an arcuate lug 34 freely received within the channel 25 of the bar. Slidably surrounding the bar aboy e the plate 33 is a similar bearing plate or ring 35 which, as shown in Figure 5, is provided at one side with an arcuate lug 36 similar to the lug 34 of the ring 33, the lug 36 being also freely received within the channel 25 of the boring bar. Confined between said bearing plates is a nut having radiating wings (Figure 6) extending lengthwise thereof to provide a feed star 37 threaded'upon the feed screw 27 and provided at its opposite sides with tubular trunnions or hub flanges 38 journaled through the lugs 34 and 36 of the bearing plates. The feed star is, as best shown in Figure 6, preferably provided with four wings but the number of wings employed upon the star may, of course, be varied. As will be perceived, when the boring bar is rotated, the lugs of the bearing plates will coact with the bar to effect turning of the plates therewith so that the boring bar, the plates, the feed screw, and feed star will revolve as a unit. Formed on the bearing 21 at one side thereof is a radially directed enlargement 39 from which extends an overhanging bearing 40 and extending through this bearing is a shaft 41, the inner end of which is journaled in a suitable opening in the adjacent side of the bearing 21. Fixed to the inner end portion of said shaftwithin the enlargement is a beveled pinion 42 projecting into the gear case and holding the shaft against longitudinal movement is a collar 43, while with the outer end portion of the shaft is removably engaged a crank 44. Resting upon the bearing plate 35 to coact with the cap plate 20 of the gear case is a beveled gear or pinion 45 meshing with the pinion 42. The gear 45 slidably receives the boring bar therethrough and, as best shown in Figure 4, is provided at one side with. a key or boss 46 freely received within the channel 25 of the bar but coupling the gear with the bar so that when the gear is driven by turning of the crank 44, the bar will be rotated. As will be observed, the boss 46 is cut away to freely accommodate the feed screw 27.

Integrally formed on the side wall of the gear case are spaced vertical reinforcing ribs 47 and threaded through adjacent ribs at opposite sides of the case are sleeves 48 lying in the plane of the feed star 37 and which may be adjusted radially with respect to the axis of the boring bar. Threaded upon the outer end portions of said sleeves are nuts 49 and slidable in said sleeves are pairs of feed dogs 50 provided at their inner ends with flattened terminals 51 and having stems 52 slidably projecting through the outer end portions of the sleeves. Fitting through the stems are laterally directed pins 53 and, as will now be observed upon particular reference to Figures 4, 5 and 6 of the drawings, the outer end portions of the sleeves 48 are provided at their upper sides with substantially L-shaped slots 54 freely receiving said pins. Surrounding the stems of the dogs within the sleeves 48 are springs 55 urging the dogs inwardly. When the boring bar is rotated, the feed star 37 will, of course, travel in a circular path and, as will be noted, the terminals 51 of the feed dogs normally project into said path for engagement with the teeth of the star, the fiat sides of said terminals being presented to the star teeth. In this position of the dogs, the pins 53 thereof are disposed in the laterally directed portions of the slots 54 in the guide sleeves 48 so that the dogs will thus be locked in active position. However, by rotating the dogs until the pins are brought into the longitudinally directed portions of said slots, the dogs may be retracted to inactive position and the dogs moved. to engage the pins with the outer ends of the guide sleeves for holding the dogs so rctracted.

As will now be readily understood in view of the receding description, the crank 44 may be turned for rotating the cutter 24. Coincidently, the feed star 37 will engage the terminals 51 of the feed dogs 50 selectively to be rotated step by step by said clogs so that as the boring bar revolves, the cutter will be advanced into the yl de :7 the f ed; c ew 2 b g helC1 aga nst nd v dua o ion and he fe dv ar tra ling upon sai se ew long tudina ly th reete ryh rete o eed f. he o g ar fo e o s an 5m i re a ieh h eet, it s mpl t e ssary o re ract ne or more of the fieec dogsitorinactive, position in the manner previously explained. In reboring the. engine cylinder it is. quite o-fiten necessary. to remove cu-tterhead so that the p g e 0 th work may e carefully inspected. To; accomplish this. object, the crank 4% is removed as is also the locking Plate 32. A crank 55-. isas show F g re than w th. the te n l t. t e feed screw, and operated for counter-rotating the screw, the feed star 3'2 being moned to engage one ofith e. feed do 3, to be held. agai s o a ion h y )1- S nse-.- qtle it y,v o ter-ro a i n of th feedcr w ll, u der such eeadit ns, erve to e ra he eu terheetl d, as w l be. no ed, th culte'rhead may be WithdI i. t t P S t QL i h n the base l v Ac ordingly, y en oring the. cap. bolts: 19, th st i case 16 y be eta ed from t e bas fo nt ely removing the utterhead when access to, the yl d y h easilyadhe u te had may, W ll th sfb ee he emov d f om he cyl W hou rocket g h cen er g off t e bas 10 o: tha when ts esired to, com le the bor g Of th y inder, the ge r case nu simplyv e replaced upon the ase. hen t e c terhead wi l be acc r te y cent red. th sp ct to thee-ylmder.

Havingthus fully described my said invention, what, I claim, as new desire to sec re y Le ters Pate t is:

1;. A cylinder reboring machine including supporting means, a boring bar journaled thereon, a feed Screw carried by the bar, ear g plat s lida le pon thehe a ee Z-fl T- lP thev s rew confin d; be een ai plat s, and means: up n the upport ng means, dispo ed to ngage id s ar for advancing the bar upon. rotation thereof.

2. A cylinder reboring machine including supporting means, a boring bar journaled thereon and provided with a'chann'el a. feed screw j ournaled upon the bar extending Wi hin aid channel, bearing plates sl-idable pon the bar a d having lugsproject ng th n. the chan e a d teaming he'pla to the bar to, turn therewith, a teed star upon the SQIEW having trunnions. jonrna-led in said plates, and means upon the supportg means d spo ed to ngage star for advancing the bar upon rotation thereof.

3. A cylinder reboring machine including a gear case having top and bottom Walls, a boring bar journaled through said Walls, a feed screw upon the bar, bearing plates slidable upon the bar, one of said plates coacting with the bottom Wall, a feed star 11 pen the scre onfined betw e .v aid, plat a drive; gear lidah e pen he her b t coupled; therewith fo dr ng th er, Said gear enacting with the ther 0t sa d; p te and he top wall of; he gear ase, n means pon the g ar case d sposed to e gage Seitl tor adv nc ng he ar upon. r ation, thereo 4s. A, cylinder reboring machine including uppor ingm ans, a g d nal y mova e boring been journa ed' he o feed re carried by the bar eccentrically tliiereofgieeding means r atable o a d Screw r a aheing he s ew and he l ng tud nal y, means upon sai supp rting mea t oas with the. feeding means for rotating the feed g m an hen he ha s turne a d means for norma y l ok ng t t e-cl scr ga nst n ividua rotation.

5- A cyli der hor ng machine ncluding smpp rt ng means. a ng u nal- 1v o able boring bar iosrua e l thereem a teed ar i d by the ar eee ntr eal r th r ei, feeding means r atahle idfs r for ad ncing the screw and her long t din lly,

means, upon said ppo ting mea s to es With the dingmeen ro at ng the fee i g mean Wheat e bar s tu ne a a locking plat t co s bet een he an th upset end of. e feed; c ew fo t normally ocking e crew ag nst. dividua e eti n- 6,. A y n er reher gy m chinel i upporting mea s, a, long udina ly h' vab-l boring; bar journaledthereon, a feed screw carried; by the bar eccentrical-ly thereof, B 1 iIlm$flh S: i3i3-hl!% on aid s e for advancing the screw and bar longitudinally and means upon said supporting means to coact with the feeding means for rotating the feeding means when the bar is. turned and adapted to lock said feedingmeans against individual rotation whereby the feed screw may be turned and the bar retracted.

'Z. A cylinder reboring machine including supporting means, a, boring bar journaled thereon, feeding means carried by the bar. and dogs upon the supporting mean-s normally. disposed to selectively engage said fieeding means for advancing the bar upon ro ation thereof, the dogs being retractable to inactive position for varying the rate of feed of the bar for a constant rate of rotai n ther of 8. A cylinder reboring machineincl-uding in retracted position.

9. In a cylinder reboring machine, the combination with a rotatable longitudinally novable boring bar, of supporting means for the bar, an eccentrically located feed screw carried by the bar, feeding means upon said screw disposed to travel in a circular path when the bar is rotated, and stationary means upon said supporting means disposed for engagement by said feeding means: in its traveling movement for advancing the bar longitudinally upon rotation thereof.

10. In a cylinder reboring machine, the combination with a rotatable longitudinally movable boring bar, of supporting means for the bar, an eccentrically located rotatable feed screw carried by the bar, feeding means upon said screw disposedto travel in a circular path when the bar is rotated, stationary means upon said supporting means disposed for engagement by said feeding means in its traveling movement for advancing the bar longitudinally upon rotation thereof, and means coacting between the bar and screw at one end the screw nor mally locking the screw against rotation during the feeding operation.

11. In a cylinder reboring machine, the combination with a rotatable longitudinally movable borin bar, of supporting means for the bar, fee ding means mounted to travel with the bar in a circular path when the bar is rotated, and companion stationary means upon said supporting means disposed for engagement by said feeding means in its traveling movement for advancing the bar upon rotation thereof and movable independently of each other to inactive position for varying the rate of such advance for a constant rate of rotation of the bar.

12. In a cylinder reboring machine, a casing, a boring bar carried thereby, a cutterhead on the bar, means on the casing for rotating the bar a hollow base adapted to be secured to a cylinder block independently of the casing with its bore in alinement with a cylinder, an annular shoulder on the casing fitting within the bore of the base, and means for securing the casing detachably to the base, substantially as set forth.

13. In a cylinder reboring machine, a casing, a boring bar carried thereby, a cutterhead on the bar, a hollow base adapted to be secured to a cylinder block with its bore in alinement with a cylinder, an annular shoulder on the casing fitting within the bore of the base, means for securing the casing detachably to the base, a detachable cap plate at the upper end of the casing having an 'a mular shoulder resting in an annular recess of the casing, means for detachably securing the cap plate to the casing to center the plate relative thereto, a gear on the boring bar, and means for driving said gear including a gear carried by the cap plate having teeth meshing with the firstnamed beveled gear, substantially as set forth.

14. A cylinder reboring machine includ ing a support, a boring bar journaled thereon, a feed screw carried by the bar near the periphery of said bar and parallel to its axis, a nut upon said screw, and means upon the support to rotate said nut for advancing the bar and the feed screw upon rotation thereof, substantially as set forth.

15- A cylinder reboring machine including a boring bar having axial and rotary movement, a support therefor, an eccentrically mounted feed screw movable lengthwise with the bar, anut rotatable on the screw but held against movement lengthwise of the same, and means on the support to cause relative rotation between the screw and the nut upon rotation of the bar.

16. A cylinder reboring machine including a boring bar having axial and rotary movement, a support therefor, an eccentricallymounted feed screw movable lengthwise with the bar, a nut rotatable on the screw but held against movement lengthwise of the same, and means on the support to vary the rate of relative rotation between ]the screw and the nut upon rotation ofthe 17. In a cylinder reboring machine, a support, a boring bar journaled thereon, a feed screw on the boring bar, a nut on the screw, means for rotating the nut as the boring bar rotates to feed the bar through the work, locking means on the boring bar for normally holding the feed screw against rotation relative to said boring bar said locking means when released permitting the screw to be rotated independently of said boring bar, substantially as set forth.

18. A cylinder reboring machine comprising a support, a boring bar journaled thereon, feeding means including a planetary element on the bar, and means on the sup port for selectively varying the rate of feed of the boring bar, substantially as set forth.

In witness whereof, I have hereunto set my hand and seal at WVashington. D. C., this 9th day of May, A- D. nineteen hundred and twenty-f0ur.

FREDERICK T. FL-INCI-IBAUGH. 

